WO1992016710A1

WO1992016710A1 - Electronic locking device

Info

Publication number: WO1992016710A1
Application number: PCT/AT1992/000030
Authority: WO
Inventors: Roland GRÖSSINGER; Christian Schotzko
Original assignee: EVVA-WERK SPEZIALERZEUGUNG VON ZYLINDER- UND SICHERHEITSSCHLÖSSERN GESELLSCHAFT m.b.H. & Co. KOMMANDITGESELLSCHAFT
Priority date: 1991-03-15
Filing date: 1992-03-06
Publication date: 1992-10-01
Also published as: ATA58791A; AT399193B

Abstract

The invention relates to an electronic locking device in which there are at least one switching magnet (5, 6, 13, 14) and at least one pulse wire sensor (9) to generate electric power for the locking device and/or for the electronic conversion of a magnetic code for the locking device.

Description

Electro-magnetic device

The invention relates to an electronic lock. Known electronic locks have an electronic memory in the key that has stored a code. After the key has been inserted into the barrel, an electronic circuit of the lock reads the contents of the lock, compares it with a reference code and, if the code is correct, releases the lock by means of an electrical-mechanical device. The reading and evaluation of the stored code takes place via electronic circuits which have to be supplied with electrical energy. There are two major problems with the implementation of electronic locks. One problem is the power supply and another problem is the implementation of a code with a large number of variations that cannot be scanned from the outside. For typical electronic circuits that are suitable for locks, an energy that is between 100 and 500 mW is required. In conventional electronic locks, this energy is provided by a battery, an accumulator or by connection to the mains. The energy supply with an accumulator or a battery has the part that these power sources only have a limited lifespan, which can range from a few months to a few years. Such locks have to be maintained continuously. This means that unlimited functionality cannot be guaranteed. Power supply from the network requires a power supply by means of a cable, which is complex and in some cases also impossible. In addition, a possible interruption of the supply line is a weak point in the system.

According to the present invention, at least one switching magnet is provided in the key or in the lock and in the lock or key, a pulse wire sensor is provided for power generation and / or for generating code pulses.

The physical basis of the energy source described here is as follows:

A soft magnetic thin wire is due to its special

Geometry (long length) magnetized inside the wire axis. If you now pass a permanent magnet that has a stray field that is anti-parallel to the wire magnetization and larger than the demagnetizing field (perpendicular to the wire axis), the wire is quickly re-magnetized (Wiegand effect). If a coil is now wrapped around the wire, a voltage pulse is induced in this coil as a result of the change in flow. Such an element is called an impulse wire sensor in technical literature. The voltage dispense emitted to the outside by such a pulse wire sensor is typically 3 V and takes about 10 μs, which corresponds to a pulse power of about 4.5 mW.

In the arrangement according to the present invention, preferably as many such pulse wire sensors as possible are installed in the lock or in the key and connected in series or in parallel. In one embodiment variant, high-quality small permanent magnets are provided on the key at least in accordance with the number of pulse wire sensors provided, which are mutually antiparallel inside. When the key is inserted, the magnets in each pulse wire sensor move through magnetize the pulse wire, voltage pulses are generated. If, for example, 10 sensors and 10 magnets are used on the key, a total of 55 voltage pulses are generated, which corresponds to a total output of around 250 mW.

According to another variant of the invention, the pulse wire sensors can be provided in the key. At least two anti-parallel magnets are provided in the castle, which magnetize the wire sensors and generate the voltage pulses. In this way, the electronics containing the electronic code on the key can be supplied with energy easily and without complicated transmission devices.

The voltage pulses are preferably rectified with full-wave rectification, as a result of which the polarity of the pulses is immaterial. A buffer capacitor, which provides the energy for the electronics, is charged with the current rectified in this way. The fact that a pulse wire sensor generates a pulse or not depending on the position of the stray field of the magnet (parallel, antiparallel) can be used to read the magnetization directions contained on the key and thus to form a binary code number. The impulses can be processed electronically.

The invention is explained below with reference to the drawings, for example. All figures are schematic. 1 shows a cross section through a cylinder lock in a first variant. 2 shows the view of the key inserted in the lock according to FIG. 3 is the view of the key in a further variant. Figure 4 is a partial section along the line IV-IV in Figure 1. Figure 5 is partially a Section along the line VV in Fig. 8. 6 shows in cross section a further embodiment of the locking device according to the invention and FIG. 7 shows a partially sectioned view of the associated key. 8 shows a cross section through a cylinder lock with a key according to FIG. 3. Fig. 9 shows an example of a block diagram of the electronics.

According to Figure 1, a cylinder core 2 is rotatably mounted in a cylinder housing 1. The key 4 is inserted into the key channel 3 and has a magnet pair in the cutting plane consisting of two continuous magnets 5, 6. A stray field 7 is formed between these two magnets 5, 6. This must be greater than the demagnetizing field perpendicular to the soft magnetic wire pin 10 of the pulse wire sensors 9.

In the cylinder core 2, a pulse wire sensor 9 is arranged in recesses 8 along the key channel 3, which essentially consists of a soft magnetic wire pin 10 and a coil 11. The recess 8 can be either open towards the key channel 3 or covered by a magnetically permeable layer, as shown in FIG. 1 in the right recess. Alternatively, the recess 8 can also be filled with a magnetically permeable lasse. As can be seen in FIG. 2, a plurality of magnets 5, 6 (magnet pairs) are arranged in parallel in the key shaft 12 of the key 4 (shown broken off), each magnetized in different directions (antiparallel). 4 is a section along the line IV-IV in FIG. 1 for the first embodiment variant and shows the pulse wire sensors 9 adjacent to the key magnet 5 in the recesses 8 of the cylinder core 2. In Figure 1 is further purely schematic and, for example, an electronic lock 33 is drawn. A locking pin 35 is slidably arranged in a bore 34 and projects under the pressure of the spring 36 into the locking recess 37 of the cylinder core 2. A locking pin 38 projects laterally into the bore 34 and thus blocks the locking pin 35, so that the cylinder core cannot be rotated. The locking pin 38 can be pulled to the right out of the bore 34 by an electromechanical device 39, so that the locking pin 35 can be pushed down and the cylinder core can be rotated.

The electromechanical device 39 is controlled via an electronic circuit and releases the lock if the key has the correct coding. The device 39 can also be supplied with power by the pulse wire sensors.

In a second variant of the invention, the key magnet pairs 5, 6 can also be replaced by static magnets 13, as shown in FIGS. 3 and 5. In the key shaft 12 of the

Key 4 (shown broken off) are parallel to one another a plurality of magnets, each magnetized in different directions (antiparallel). 5 is a partial section along the line V-V in FIG. 8 for the second variant and shows the pulse wire sensors 9 adjacent to the key magnets 13 in the recesses 8 of the cylinder core 2 on one side of the key channel. In this variant, it is also useful to use magnet pairs (consisting of magnets 13 and 14) on both sides of the

Key shaft 12 to provide a higher energy density.

Whenever a pulse wire sensor is in the area of the litter Field 7 of the magnets arrives and there is a change in the direction of magnetization of the pulse wire, a current pulse is induced in the coil 11, which can make its contribution to the power supply of an electrical circuit.

In the embodiment variant according to FIGS. 6 and 7, the pulse wire sensors 9 lie in recesses 32 of the key 4 and the magnets 17 lie in the recesses 8 of the cylinder core 2.

FIG. 7 shows the associated key 18, which has the integrated electronic circuit 19, which contains the electronic code information or the code evaluation. Via lines 20, 21, the integrated circuit 19 is supplied with current by the shown pulse wire sensors 9, which are connected in parallel, after appropriate rectification (see FIG. 9).

8 is self-evident on the basis of the description given above. The same parts have the same reference numerals.

Fig. 9 shows the basic block diagram. Three pulse wire sensors L1, L2 and 13 corresponding to the pulse wire sensors 9 are connected in parallel. The current pulses are fed to the rectifier 26 via the lines 20, 21. The capacitor 24 is used for energy storage. The switch 28 can be closed, for example, when the key is inserted into the key channel. With 29 the internal electronics for code recognition and evaluation of the key information is designated. The electromagnetic opening mechanism 30 is actuated by the electronics, as is shown, for example, in FIG.

The technical mode of operation of the pulse wire sensor below the following:

As already mentioned, the sensor element consists of the pulse wire, which is made of a special, soft magnetic material, and the sensor coil. The impulse wire is fixed in the coil body, the coil therefore surrounds the wire.

The pulse wire is now remagnetized in an alternating magnetic field, as a result of which voltage pulses are generated in the sensor coil. The pulse energy is completely removed from the magnetic field. The sensor therefore does not require a power supply. The pulse is triggered when the magnetic field strength in one direction exceeds a certain threshold. An opposite magnetic field returns the sensor to its initial state. Permanent magnets are therefore particularly suitable for actuation.

In the case of the present invention, the pulse wire sensor is used to supply energy to the key or lock system and / or to reliably detect a magnetic code in the key or lock that is not susceptible to faults.

Claims

EXPECTATIONS

1. Electronic locking device, characterized in that at least one switching magnet for generating electrical energy for the locking device and / or for electronic implementation of a magnetic code of the locking device

(5,6,13,14) and at least one pulse wire sensor (9) are provided. 2. Locking device according to claim 1, characterized in that it has a lock (1,

2) and a key (4) which can be inserted into the lock or which can be attached to the lock and that either the key has the switching magnets (5, 6, 13, 14) and the lock the pulse wire sensors (9) or the key the pulse wire sensors (9) and the lock the switching magnets or

Lock and key has both switching magnets and pulse wire sensors.

3. Locking device according to claim 2, characterized in that a key channel (3) is provided in the lock, which has one or more recesses (8) for receiving the pulse wire sensors, wherein the recesses (8) are open to the key channel.

4. Locking device according to claim 3, characterized in that the recesses towards the key channel are covered by a magnetically permeable layer (31).

5. Locking device according to one of the preceding claims, characterized in that a row of pulse wire sensors (9) are provided on two sides of the key channel.

6. Locking device according to one of the preceding claims, characterized in that the pulse wire sensors (9) are arranged substantially perpendicular to the direction of insertion of the key.

7. Locking device according to one of the preceding claims, characterized in that the key (the lock) for each pulse wire sensor (9) of the lock (the key) has a magnet pair (5,6).

8. Locking device according to one of claims 1 to 6, characterized in that the key (the lock) for each pulse wire sensor (9) of the lock (the key) has a bar magnet or a corresponding magnetized area which extends approximately in the same direction like the associated pulse wire sensor.

9. Locking device according to one of the preceding claims, characterized in that the / the pulse wire sensors (9) are arranged in recesses (32) of the key, to which the magnets (17) in the lock are assigned (Fig. 6), the recesses ( 32) are optionally covered by a layer (33) of magnetically permeable material.

10. Locking device according to one of the preceding claims, characterized in that the Strαninpulse the Impulsdrahtsensαren (9, L1, L2, L3) via a rectifier (26) feed an electronic circuit (29) through which an electromagnetic opening mechanism (30,33) is operated.